That is the wish of the ICC, who wants it implemented during the 2011 ICC World Cup.

The ICC Cricket Committee wants to implement the Umpire Review Decision System across all Test matches at the earliest time possible while wanting to utilize during the 2011 ICC World Cup in the Indian sub continent.
The UDRS system has received mixed response upon its limited implementation and it will depend on whether the broadcasters are willing to foot the bill, one of the reasons why the system has been largely shelved.
Amongst other things discussed at the annual meeting at Lord’s included the controversial subject of switch hit, and the ICC considered the option of leaving it to the bowler, “Should the bowler see a batsman change his grip or stance prior to the delivery stride the bowler can decide not to bowl the ball.”
Another topic was about discouraging the non striker from backing up too far to steal a run. Here is the official version: "ICC Cricket Committee agreed that batsmen trying to steal ground when the bowler is running in to bowl should be discouraged. They will look at regulations that require a batsman to remain in his crease until the bowler's front foot lands."
Andy Flower Disapproves of UDRS
Ricky Ponting Fumes That Test in Not the Place for UDRS Testing
SA Follow India's Lead Against UDRS; New Zealand Go Ahead
UDRS Will be Used in South Africa After Considerable Pressure
Australia Will Use UDRS Against the West Indies
Sri Lanka Moan Lack of UDRS; Complaints Rise from the Australia WI Test series